Mode of renewing the surface of printers  rolls



i NETE@ Sita'rasv PATENT Ottica.

CHARLES SENTELL, OF WATERLOO, NEW YORK'.

Specification forming part of Letters Patent No. 48,453, dated June 27, 1865.

To all whom it may concern.-

Beit known'that I, CHARLES SENTELL, of Waterloo, in the county of Seneca and State of New York,have invented a new and useful Improvementin Removing and Renewing the Surfaces of Printers Rollers, and Ido hereby declare that the 4following isl a full and exact description thereof, reference beinghad to the accompanying drawings, making part of this specication. A

Figure 1 is a central vertical section of the cylinder or mold in which the surface of the stripped roller is recast, havin g situated therein a roller whose surface has been removed ready for recoating; 1"ig.2, a plan of the same device 5 Fig. 3, a perspective view of a roller with its surface removed ready for recoating; Fig. 4, a similar view of theroller afterit has been recoated.

Like letters of referenceindicate corresponding parts in all the figures.

Printers hiking-rollers are made of a composition of glue and molasses or sugar, in such proportions as to produce the desiredelasticity and adhesiveness. In ordinary use these rollers soon become hard or dead on their surfaces, and lose those qualities that give them special value. But the surface of. the .roller only is injured, the interior being as good as when new. If, therefore, the surface could be removed and a new surface cast around the body of the roller, there would be no necessity ofsubstituting a new roller in each case. In ordinary use,when the surface becomes useless the whole roller is thrown aside, and, as the cost of the material at the present time is about twenty cents per pound, there is thus considerable loss, as each roller weighs several pounds.

It is the object of my invention to remove the surface of the rollers thus become useless in such a manner that the roller can be placed in a hollow cylinder or mold of a little larger diameter than itself and have cast around it on every side sufficient of the new material to supply the place of that taken o.

As representedin the drawings, A is an ordinary printers inkingroller, made of the material before mentioned, andcast around the usual shaft on bearing B. Fig. 3 represents the roller as havingits surface removed to any suitabledepth-say one-fourth of an inch, more or less. This may beaccomplished in any convenient manner; but I prefera machine of my own inventionfor the purpose, on which I have made application for patent. From the extre melyV elastic and yielding nature of the compound it is very difficult to remove the surface; but by my arrangement above referred to I accomplish it perfectly, and without tearing or mangling the roller in the least, leaving it in that slightly-roughened but uniform condition of surface that will best receive and` hold the material that is cast around it. The roller thus prepared is placed in a hollow cylinder orniold., C, whose diameter is as much larger than that of the stripped roller as is necessary to form a perfect rollerof suitable size. A space,`a, is thus left between the roller and the sides of the mold, into which the melted material is poured.` Thelower end of the cylinder or mold lits closely into a socket or cup, D, which is provided with a floor, b, having in the center a hole, through which passes the end of the shaft B, as shown in Fig. l. On the upper end` of the shaft fits closely a socket, E, having radial arms c c, Fig. 2, which extend outward, resting aganstthe sides of the mold, and leaving spaces d d between them, so that the composition may be poured in. By this means it will be perceived that the stripped roller is accurately centered in the molds. rEhe roller be-v ing thus fixed in placein the mold, the composition is poured atV the top into the space a, and when hardened by cooling a perfect roller is formed, as indicated in Fig. 4, in which the new coating is indicated by the thickness w in hering with great tenacity.

The advantages of this method are obvious without particular specification. It is only necessary to remove a thin coating from the surface of a roller at any time when the surface becomes dead or hard, or from any cause is injured, and recast it, and when so recast it answers the purpose of an entirely new roller. It is of equal value, when so recast, with a new one. It is more easily done than to strip the composition entirely from ihecore, makingan entirely new roller, and the saving it effects is in proportion to the quantity ot' composition remaining on'tllc core, which is from one-half to three-fourths. The surface of the same roller may thus be renewed for an indefinite period, as theinterior is not, like the surface, impaired in value by time or use. Indeed, there is reason to believe that rollers with surfaces so renewed Will last for years. The experience of the undersigned Warrants his assertion that such Will be the case when rollers are properly made in the rst instance.

The great economy of material is eviden-t, and the value of the invention clearly manifest Wlienit is remembered that froxnvone-half to three-fourths of the composition of a roller is saved when its surface is renewed, because the composition, when strippedv entirely from a roller, can rarely be remelted, and some of the best kinds in use cannot be remelted under any circumstances.

What I claim as my invention, and desire to secure by Letters Patent, is-

Removing the hardened surface ot' printers rollers and recoating the same by placing them in the mold G andturning the melted material around them, substantially as herein set forth.

CHARLES SENTELL.

Witnesses:

R. F. Oscoop, J. A. DAVIS. 

